You could just smarten up and stop bringing the car to the dealer... Also, VF turbos are cheap. You can get one used for less than $500.
Instead of asking the infinite wisdom of the derpwebs... Why not just bring the car to your tuner and ask him what's wrong. OR, find someone like me that is local to you, who can go through the car for a few beers... I personally wouldn't be stealing your ****, because I've got some actual integrity.